laravel中怎么实现下面的SQL select sum('profit'),sum('order_count') from pro where......; 参考 self::where('id', $id)->first( array( \DB::raw('SUM(profit) as profit'), \DB::raw('SUM(order_count) as order_count') ) )->toArray();
今天碰到一个比较有疑惑的问题,就是在统计和的时候,我们往往有时候查不到数据,都会再加个 nvl(sum(字段),0) 来显示这个字段,但是如果我们再加个group by ,就算有加入这个 nvl(null,0) 的这个函数,也查不到一条数据的疑惑进行解释如下:1 首先我们查下这个语句:是查不到一条数据的如下图:select a.area_code, a.calltimes,a.queuetimes from ngcc_log.t_rpt_call4traffic_xm a wh
显示每个地区的总人口数和总面积.仅显示那些面积超过1000000的地区. SELECT region, SUM(population), SUM(area) FROM bbc GROUP BY region HAVING SUM(area)> 在这里,我们不能用where来筛选超过1000000的地区,因为表中不存在这样一条记录.相反,having子句可以让我们筛选成组后的各组数据
工资表t_salary如下: id month name salary 1 201601 Jim 12 2 201601 Bruce 30 3 201601 Peter 23 1 201602 Jim 20 示例一: select id,sum(salary) from t_salary group by id; 示例一是对的 示例二: select id,name,sum(salary) from t_salary group by id; 示例一会报错. 因为使
update Countrys set ( Abbreviation_cn, Abbreviation_en, Two_code,Three_code, Number_code)= (select [cn_name], [en_name], [two_code], [free_code], convert(int,number_code) as [number_code] from Country.dbo.worlds a where a.cn_name=Countrys.Abbreviatio
SELECT TOP 1000 [id], case when group_id>1 then 'vip' else '普通会员' end FROM [YaleBaoV2].[dbo].[ylb_users] SELECT TOP 1000 [id], case group_id when 1 then '普通会员' when 3 then '代理商' when 4 then 'VIP用户